registers. rationale:
- Netwave cards choke if we map i/o memory to >= 0x400
- even though, CIS tuple talks nothing about it
- it is not possible to specify range in pcmcia_io_map
- it would be very bad to do a try-and-error bus_space allocation for
i/o memory regions < 0x400
- we can have exactly the same functionality with memory mapped access
this should correct PR 10139.
the memory mapped access idea was from WIDE wildboar/bsdi cnw code.
- implement ioctls compatible with bsdi/freebsd-pao. stat type is
changed from u_int to u_quad_t to avoid overflows. now it is possible
to switch domain/encryption key from the userland, using cnwctl(8).
- implement multicast/promiscuous mode. tested with IPv6.
